Geared electric motor

Abstract

A geared electric motor comprises: an output gear configured to rotate around an axial line parallel to a rotor shaft as an axis of rotation; an output shaft configured to rotate integrally with the output gear, the output shaft being arranged at a position facing an input gear with a distance in a direction of the axis of rotation; a first holding member holding the rotor bearing; a second holding member holding a first output bearing; and a third holding member holding a second output bearing. The first holding member, the second holding member, and the third holding member are fixed to each other with the third holding member sandwiched between the first holding member and the second holding member.

1 . A geared electric motor comprising:
 an input gear provided to a rotor shaft of an electric motor;   a power transmission mechanism including at least one gear configured to rotate by receiving a rotational force from the input gear;   an output gear configured to rotate by receiving a rotational force from the power transmission mechanism and output the rotational force to the outside, the output gear rotating around an axial line parallel to the rotor shaft as an axis of rotation;   an output shaft configured to rotate integrally with the output gear, the output shaft being arranged at a position facing the input gear with a distance in a direction of the axis of rotation;   a rotor bearing rotatably supporting the rotor shaft, the rotor bearing being arranged on a side opposite the output shaft across the input gear;   a first output bearing rotatably supporting the output gear, the first output bearing being arranged on a side opposite the input gear across the output gear;   a second output bearing rotatably supporting the output gear, the second output bearing being arranged on an input gear side of the output gear;   a first holding member holding the rotor bearing;   a second holding member holding the first output bearing; and   a third holding member holding the second output bearing,   wherein the first holding member, the second holding member, and the third holding member are fixed to each other with the third holding member sandwiched between the first holding member and the second holding member.   
     
     
         2 . The geared electric motor according to  claim 1 ,
 wherein an axial line of the rotor shaft coincides with an axial line of the output shaft.   
     
     
         3 . The geared electric motor according to  claim 1 ,
 wherein the third holding member is a plate-shaped member, and   wherein the first holding member, the second holding member, and the third holding member are integrated with each other by a fastener that penetrates the third holding member and that fastens the first holding member and the third holding member.   
     
     
         4 . The geared electric motor according to  claim 1 , wherein the power transmission mechanism comprises:
 a countershaft parallel to the rotor shaft, the countershaft being rotatably supported by the first holding member and the second holding member;   a first transfer gear configured to rotate integrally with the countershaft, the first transfer gear meshing with the input gear; and   a second transfer gear configured to rotate integrally with the countershaft, the second transfer gear meshing with the output gear.   
     
     
         5 . The geared electric motor according to  claim 1 ,
 wherein the first output bearing and the second output bearing are angular ball bearings or tapered roller bearings,   wherein the second holding member is provided with a first restriction portion, the first restriction portion being in contact with a part of side surfaces of the first output bearing, the part being located on a side opposite the output gear, the first restrict portion restricting a displacement of the first output bearing toward the side opposite the output gear, and   wherein the third holding member is provided with a second restriction portion, the second restriction portion being in contact with a part of side surfaces of the second output bearing, the part being located on a rotor shaft side, the second restriction portion restricting a displacement of the second output bearing toward the rotor shaft side.